270 New Species of Bird of the Genus Enrjijptila. 



not; but the careful observer must surely recognise that it is 

 because at the north the temperature is lower. He must also 

 accept these facts as a demonstration that the prime factor in 

 the production of the phenomena of the Ice Period, was a secular 

 depression of temperature : that it was a period of cold and not 

 of warmth. 



XII. — Description of a New;. Species of Bird of the Genus 

 Engyptila, with Notes on two Yucatan Birds. 



BY GEORGE X. LAWRENCE. 

 Read October 26. 1885; 



Engyptila vinaceifulva. 



The front is of a pale vinaceous white, the hind part of the head and the 

 hind neck, are of a rather light reddish vinaceous, the hind part and the 

 sides of the neck are glossed with very pale crimson, only perceptible in 

 certain lights ; the feathers of the back are of a light, tawny, ending largely 

 with a very pale tawny-white ; the feathers of the rump and upper tail 

 coverts are of a darker and brighter tawny than the back, with lighter 

 colored margins ; the two central tail-feathers are of a warm tawny color 

 for half their length from the base, the terminal portion being very much 

 lighter in color with a grayish cast ; the shafts of these are white ; the 

 other tail-feathers are light tawny-brown, their outer margins narrowly- 

 edged with whitish, and their ends terminating with white having just a 

 tinge of tawny ; these have their shafts tawny-white ; the smaller wing- 

 coverts are in color much like the rump; the middle and larger co- 

 verts are lighter and warmer in color ; the quills are of a light brown 

 ish-tawny, with their ends and outer margins whitish, the shafts are 

 light tawny in color ; the under wing-coverts are bright cinnamon red, and 

 the inner margins of the quills are very pale cinnamon ; the sides of the 

 head are colored much like the front ; the chin is pure white ; the throat 

 and upper part of the breast are light vinaceous, the lower part of the breast 

 is of a lighter shade of the same color ; the abdomen and sides are of a very 



